Valve-gear



( o Model.)

L. W. BRYAN.

VALVE GEAR.

iNVENTOR DEM Jul/P n ATTORNEYS.

Patented. July 27, 1886.

H WITNESSES:

\oLithographur. win-mm n. c.

FFICEo ATENT il- LOUIS \VILSON BRYAN, OF QUINCY,

ILLINOIS, ASSIGNOR TO HIMSELF, AND

CHARLES 0. LEE, OF IALMYRA, MISSOURI.

VALVE-G EAR.

ECIFICATION forming part of Letters Patent No. 346,190, dated July 27,1886. Application filed February (I, 1880. Serial No. 191,098. (No model.)

To aZZ whom it may concern:

Be it known that I, LOUIS WILsoN BRYAN, of Quincy, in the county of Adams and State of Illinois, have invented a new and useful Improvement in Valve Gears for Steam- Pumps, of which the following is a full, clear, and exact description.

The object of my invention is to provide a new and improved valve-gear for steam-pumps in which the valves are relieved of all press- 11 re as soon as they leave their respective seats.

The invention consists in various parts and details, and combinations of the same, as will be fully described hereinafter,and then pointed 15 out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in both the figures.

- Figure 1 is a sectional side elevation of a steam-p11 mp provided with my improvements.

Fig. 2 is a plan view of the cylinder, the steamchest being removed.

The steam-pump A is provided with a cylinder, 13, in which is placed a piston, G, at

tached to the piston-rod D,which operates the plunger and valves in the pump E. The steamcylinder B is provided with the inlet-ports a and b, and the central port, 0, having the additional side passages, d d and (Z d. The

steam-chest F, placed on top of the cylinder B,

is provided with four partitions, F, F F", and

1 each having a central aperture, f, f, f

and f The partitions F, F F and F form 3 5 spaces 9, g, g g and g, of which the space 9 connects with the steam -port a by means of the port 6. Thespace g connects by means of theport 6 with the steam-port b, and the spaces and 9 connect by means of the ports 0 with the side passages, d d, formed in the cylinder.

The steam -chest is also provided with the steam-inlet f, which opens into the space 9 formed between the partitions F and F". The

collar-valves G and H are placed in the spaces 5 g and 9 between the partitions F and F and the partitions F and F, respectively, and are mounted on a valve-rod, I,whieh has its bearing partly in the steam-chest F and partly in a bracket, J, attached to the pump E. A

collar, K, is attached to the valvered I by means of the set-screw K, and is provided with a recess, K in which is placed a spring, M, extending a short distance beyond the collar K on the valve-rod I. A similar collar, L, is attached to the valve-rod I by means of a set-screw, L, and provided with a recess, L, in which is placed a similar spring, M, An arm, N, is attached to the piston rod 1), and its upper end slides loosely on the valve-rod I.

The operation is as follows: In the position shown in Fig. 1, the collar-valves G and H rest against the partitions F and F, and when the steam enters through the steam-inletfit passes into the space g and through the aperturef into the space 9, where it holds the collarvalve G firmly seated against the partition F, as the area of the collar-valve G presented to the steam is greater than the area that the collar valve H exposes to the steam; and from the space the steam passes through the stea1nports 0 and a into the cylinder 13, thereby forcing the piston O in the direction of the arrow a, until the arm N strikes the spring M and compresses the same into the recess If.

As soon as the arm N strikes the collar L, the valves G and II are unseated, and forced to the opposite partitions by the action of the compressed spring M on the collar L. The arm N only touches the collar L sufficiently to unseat the valves G and II slightly, as the 8 compressed spring M completes the stroke of the valve, thereby closing the aperturef by the collar G, and establishing communication between the aperturef, the space 1 and the steam-ports c and '1).

In the position shown in Fig. 1, the steam exhausts by means of the ports I) and e, the space 5 the aperturef, and the space 9 in the steanrchest to the side passages 11, leading to the exhaust c. 'On the return-stroke of the 9 piston O in the cylinder B, the arm N first compresses the spring M, and then moves the collar K sulliciently to unseat the valves G and II from the partitions F and F, respectively, and the spring M completes the stroke until the valves G and H are again seated on the partitions F and F. The exhaust in this returnstroke takes place through the ports a and 6 into spacey, through the aperturef, into the space 9 in the steam-chest F, and down no striking either collar K or L.

into the side passages, d, leading to the central exhaust, c, and out at one side of the steamcylinder. It will be seen that the valves G and II are relieved of all pressure the moment they leave their seats, thereby balancing the valves, so that only a.slight spring is required to complete their stroke from one partition to the other after being started by the arm N It will also be understood that one valve exposes a greater area to the live steam than the other as long as they are seated that is'to say, the-live steam will hold the valves G and II seated until moved by the arm N.

IIavingthus fully described my invention,

I I claim as new and desire to secure by Letters Patent 1. In a valve-gear for steampnmps, the combination of the cylinder B, having ports a, b, and c, with a steam chest, F, provided with partitions F, F, F, and F*, the steam-inlet f, and the collar-valves G and H, attached to the valve-rod I, substantially as herein shown and 7 described.

2. In a valve-gear for steam-pumps, the cylinder B, having the ports a, b, and c, thesteamchest F, having partitions F, F F and F,

and the steam-inletf, and the collar-valves G and II, attached to the valve-rod I, in combination with the pistomG, the piston-rod D,, the arm N, the upper part of which slides loosely on the valve-rod I, the springs M and inder B, having the steam-ports a, b, and c, and

M, and the recessed collars K and L, substantially as herein shown and described. 3. In a valve-gear forsteam-pumps, the cyl- 5 the side passages, d d and d d, in combination with a steam-chest, F, provided with the partitions F, F F and F, having apertures f, f f and f, respectively, and the steam-inlet f, substantially as herein shown and described.

4. In a valve-gear for steam-pumps, the steam-chest F, provided with the partitions F, F, F, and F*, having central apertures, f f f, and f", respectively, in combination with 5- the collar-valves G and H, attached to the valve-rod I, provided with the recessed collars K and Land thesprings M M, and the arm N, substantially as herein shown and described.

5. In a valve-gear for steam-pumps, the 50 steam-chest F, provided with the partitionsF, F, F, and F, having central apertures, f f f and f, and the collar-valves G and H, at-. I tached to a valve-rod, I, in combination with the arm N, the upper end of which slides loosely on the valve rod I, the springs M and M, placed in recesses in the collars K and L, which are adjustable on the valve-rod I by means of the set-screws K and "L, substantially as herein shown and described. I

' LOUIS \VILSON BRYAN.

\Vitnesses:

GEO.'H. SALMON, GEO. BLAKELEE. 

